Speedometer Calibrator
                 			                                    
                        If you’ve installed tires that are larger or smaller than original 
                        equipment tires, or if you have installed a ring and pinion gear set 
                        with a different rear gear ratio, Hypertech Speedometer Calibrator allows you to re-program 
                        for correct speedometer readings, as well as correct 
                        part-throttle shifting. The vehicle’s computer calculates your vehicle’s 
                        speed based on the diameter of the stock tires. If you’ve installed taller 
                        or shorter tires, or changed the rear gear ratio, the vehicle’s computer 
                        doesn’t know how fast your vehicle is going. As a result, the automatic 
                        transmission may not shift correctly and the speedometer readings 
                        will not be accurate (as required by law).